Residential stuff is mostly 208V/120V, although 220V is sometimes in the mix. The bigger issue is that most countries that use 220V instead of 120V also use 50Hz instead of 60Hz. Some months back, we had a pretty in-depth discussion of the subject (starting here). Companies that sell to Europe and the US (Sony, Denon/Marantz, Onkyo/Integra, Panasonic, etc.) have to provide both power supply options. In some cases, that may involve a single design with a power supply that works for both. In other cases, it means two different power supply designs that are used for separate North American and European models.

XenonMan's right that hardware is now done - it sounds like they're tweaking the finish on the front panel, which supports the logical conclusion that hardware is locked in.